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ResumenEn la zona fótica del embalse Riogrande II se analizó la distribución de la biomasa zooplanctónica en las escalas espacial (longitudinal -vertical) y temporal en función de los gradientes de estado trófico, de biomasa algal y de la precipitación. Los cladóceros dominaron la biomasa, debido a la alta contribución de Bosmina freyi, seguidos de los copépodos y rotíferos. La biomasa de especies de microcrustáceos se asoció a la estación de muestreo eutrófica y de mayor biomasa algal, mientras que la biomasa de especies de rotíferos estuvo ligada a las estaciones de menor estado trófico. La mayor biomasa de microcrustáceos fue en la temporada de mayor estado trófico y la de rotíferos en la de mayor precipitación. En el gradiente vertical, la menor biomasa de todos los grupos fue en subsuperficie, zona que tendió a ser evitada por la mayoría de especies, durante los periodos de muestreo. La expresión de biomasa zooplanctónica en el eje longitudinal y en la escala temporal, respondió principalmente al gradiente de estado trófico y de biomasa algal, y en el eje vertical posiblemente a depredación. Aunque esta respuesta no dependió del hábito trófico de las especies, probablemente por la oferta trófica diversa del embalse y por la plasticidad alimenticia de las especies, sí fue diferente entre microcrustáceos y rotíferos.Palabras clave: rotíferos, microcrustáceos, biomasa, estado trófico, Bosmina freyi. Response of the zooplankton biomass to the gradient of trophic status, and rainfall of a tropical reservoir AbstractThe distribution of the zooplankton biomass in the spatial (longitudinal-vertical) and temporal scales based on the gradients of trophic status, algae biomass and the rainfall was analyzed in the photic zone of the reservoir Riogrande II. Cladocerans dominated the biomass due to the large contribution of Bosmina freyi, followed by copepods and rotifers. Biomass of species of microcrustaceans was associated to the most eutrophic sampling station related to highest algae biomass, whereas biomass of species of rotifers was linked to stations of lower trophic status. Highest biomass of microcrustacean was in the season of greatest trophic status whereas highest biomass of rotifer was related to the strongest rainfall season. In the vertical gradient, lowest biomass of all groups occurred in the subsurface. This zone tended to be avoided by most species during the sampling seasons. The expression of zooplankton biomass in the longitudinal axis and the temporal scale mainly responded to the gradient of trophic status and algae biomass, and in the vertical axis possibly responded to predation. Although, this response did not depend on the trophic habit of the species probably due to the diverse trophic offer of the reservoir and the alimentary plasticity of these species, it was clearly different between microcrustaceans and rotifers.
ResumenEn la zona fótica del embalse Riogrande II se analizó la distribución de la biomasa zooplanctónica en las escalas espacial (longitudinal -vertical) y temporal en función de los gradientes de estado trófico, de biomasa algal y de la precipitación. Los cladóceros dominaron la biomasa, debido a la alta contribución de Bosmina freyi, seguidos de los copépodos y rotíferos. La biomasa de especies de microcrustáceos se asoció a la estación de muestreo eutrófica y de mayor biomasa algal, mientras que la biomasa de especies de rotíferos estuvo ligada a las estaciones de menor estado trófico. La mayor biomasa de microcrustáceos fue en la temporada de mayor estado trófico y la de rotíferos en la de mayor precipitación. En el gradiente vertical, la menor biomasa de todos los grupos fue en subsuperficie, zona que tendió a ser evitada por la mayoría de especies, durante los periodos de muestreo. La expresión de biomasa zooplanctónica en el eje longitudinal y en la escala temporal, respondió principalmente al gradiente de estado trófico y de biomasa algal, y en el eje vertical posiblemente a depredación. Aunque esta respuesta no dependió del hábito trófico de las especies, probablemente por la oferta trófica diversa del embalse y por la plasticidad alimenticia de las especies, sí fue diferente entre microcrustáceos y rotíferos.Palabras clave: rotíferos, microcrustáceos, biomasa, estado trófico, Bosmina freyi. Response of the zooplankton biomass to the gradient of trophic status, and rainfall of a tropical reservoir AbstractThe distribution of the zooplankton biomass in the spatial (longitudinal-vertical) and temporal scales based on the gradients of trophic status, algae biomass and the rainfall was analyzed in the photic zone of the reservoir Riogrande II. Cladocerans dominated the biomass due to the large contribution of Bosmina freyi, followed by copepods and rotifers. Biomass of species of microcrustaceans was associated to the most eutrophic sampling station related to highest algae biomass, whereas biomass of species of rotifers was linked to stations of lower trophic status. Highest biomass of microcrustacean was in the season of greatest trophic status whereas highest biomass of rotifer was related to the strongest rainfall season. In the vertical gradient, lowest biomass of all groups occurred in the subsurface. This zone tended to be avoided by most species during the sampling seasons. The expression of zooplankton biomass in the longitudinal axis and the temporal scale mainly responded to the gradient of trophic status and algae biomass, and in the vertical axis possibly responded to predation. Although, this response did not depend on the trophic habit of the species probably due to the diverse trophic offer of the reservoir and the alimentary plasticity of these species, it was clearly different between microcrustaceans and rotifers.
Habitat conditions may shape the abundance and community structure of planktonic fauna. In this study, we investigated whether reservoirs with different locations and drainage basins also differed in the structure and abundance of zooplankton. The studies were conducted in 2010-2011 between June and October in the Vistula Lagoon and Lake Łebsko. The zooplankton was dominated mainly by small eurytopic organisms belonging to Rotifera. Plankton crustaceans showed a limited diversity of species. Copepods were predominant, while Cladocera were observed sporadically in more freshwater habitats. In the first experimental season (2010), the Vistula Lagoon and Lake Łebsko showed a comparable taxonomic structure and an abundance of investigated zooplankton; a substantially higher density was recorded in Lake Łebsko in 2011, although the taxonomic diversity was higher in the Vistula Lagoon. Zooplankton biomass in a given season differed between these 2 water bodies, but not statistically significantly. The differences in location in the investigated water bodies impacted zooplankton assemblage structure and abundance. The drainage basin type (urbanized areas, forested areas, waterlogged areas) appeared to influence zooplankton species richness significantly.
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